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Cut a 4 inch square plate in halves about 1/8 inch thick and weld them where the a and b pillars meet the heater duct. Also where they meet the roof. Also where they meet the upper door opening. Run a bar or plate across where the front of the back seat bar is attached. And if you can a bar across the from the a pillar to the tunnel and to the other a pillar. Get some convertable reinforcement pan panels and weld them on. This is about as strong as you can get and maintain a stock looking interior. The next step is a cage. Most people don't think about tying it into the body, but if you do it strengthens both.
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